1 // (c) Copyright Fernando Luis Cacciola Carballal 2000-2004 2 // Use, modification, and distribution is subject to the Boost Software 3 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 4 // http://www.boost.org/LICENSE_1_0.txt) 5 6 // See library home page at http://www.boost.org/libs/numeric/conversion 7 // 8 // Contact the author at: [email protected] 9 // 10 #ifndef BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP 11 #define BOOST_NUMERIC_CONVERSION_DETAIL_INT_FLOAT_MIXTURE_FLC_12NOV2002_HPP 12 13 #include "boost/config.hpp" 14 #include "boost/limits.hpp" 15 16 #include "boost/numeric/conversion/int_float_mixture_enum.hpp" 17 #include "boost/numeric/conversion/detail/meta.hpp" 18 19 #include "boost/mpl/integral_c.hpp" 20 21 namespace boost { namespace numeric { namespace convdetail 22 { 23 // Integral Constants for 'IntFloatMixture' 24 typedef mpl::integral_c<int_float_mixture_enum, integral_to_integral> int2int_c ; 25 typedef mpl::integral_c<int_float_mixture_enum, integral_to_float> int2float_c ; 26 typedef mpl::integral_c<int_float_mixture_enum, float_to_integral> float2int_c ; 27 typedef mpl::integral_c<int_float_mixture_enum, float_to_float> float2float_c ; 28 29 // Metafunction: 30 // 31 // get_int_float_mixture<T,S>::type 32 // 33 // Selects the appropriate Int-Float Mixture Integral Constant for the combination T,S. 34 // 35 template<class T,class S> 36 struct get_int_float_mixture 37 { 38 typedef mpl::bool_< ::std::numeric_limits<S>::is_integer > S_int ; 39 typedef mpl::bool_< ::std::numeric_limits<T>::is_integer > T_int ; 40 41 typedef typename 42 for_both<S_int, T_int, int2int_c, int2float_c, float2int_c, float2float_c>::type 43 type ; 44 } ; 45 46 // Metafunction: 47 // 48 // for_int_float_mixture<Mixture,int_int,int_float,float_int,float_float>::type 49 // 50 // {Mixture} is one of the Integral Constants for Mixture, declared above. 51 // {int_int,int_float,float_int,float_float} are aribtrary types. (not metafunctions) 52 // 53 // According to the value of 'IntFloatMixture', selects the corresponding type. 54 // 55 template<class IntFloatMixture, class Int2Int, class Int2Float, class Float2Int, class Float2Float> 56 struct for_int_float_mixture 57 { 58 typedef typename 59 ct_switch4<IntFloatMixture 60 ,int2int_c, int2float_c, float2int_c // default 61 ,Int2Int , Int2Float , Float2Int , Float2Float 62 >::type 63 type ; 64 } ; 65 66 } } } // namespace boost::numeric::convdetail 67 68 #endif 69 // 70 /////////////////////////////////////////////////////////////////////////////////////////////// 71 72 73